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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61aeb6f8621754f7971cfd444f3ac0aa9b5a615d16a471fb4688f496417e6c5' 
  AND token = 'XSUqPtw9vDiSgRsrPHgHXqdStRUc48eXi6nPX4soG6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}